Process of dyeing pelts, hairs, feathers, and the like



- rate bath containing per liter 20 Patented Sept. 2, 1930 UNITED STATES PATENT OFFICE PAUL VIRCK, OF DESSU IN ANHEIM, GERMAN-Y, ASSIGN OR TO GENEBAL ANILINE WORKS, INC., OF'NEW YORK, N. Y., AICOBPOBATION OI DELAWARE rnocnss or prams rams, nuns, marinas, m) run man;

No Drawing. Application filed December 6, 1927, Serial No. 238,222, and in Germany September '14, 1926.

I have filed an application in Germany I, 29,039 IV/8m, filed bept. 14, 1926; Austria:

November 4th, 1927, Poland: filed November x X CNYHQHNQNBE x x wherein X means hydrogen or a univalent substituent such as alkyl or halogen and,

wherein Y means H, 'OH, -'-NH --NH- aryl-NH or halogen. j

The mordanted or not mordanted goods are treated with an aqueous solution of a salt of such a 4-amino-aryl-amino-derivative of the naphthalene and then with a suitable oxidizing agent; there are thus produced fast red-violet to black-blue and greenish grey tints.

The following examples illustrate the in,- vention:

Example 1.-Ii1 a bath containing er liter 2 grams of 2-(4'-aminophenylamino -naphthalene hydrochloride, some alcoholand a quite small proportion of hydrochloric acid, a thoroughly killed and, if necessary, mordanted skin is handled at the ordinary temperature for some hours. The skin'is then washed and treated for one hour in a sepagrams of potassium bichromatc and 20 grams of acetic acid of 30 per cent strength. There isobtained a blue-green dyeing. A skin which has been thus mordantcd with potassium bichromate is dyed bluer when it is subjected to the first treatment rescribed in Example 1 and then to a su sequent treatment with hydrogen peroxide in ammoniacal solution; when the preliminary lnordant is a copper compound a blackblue dyeing is produced.

Red-violet to currant tints are obtainable when 1- (4'-aminophenylamino) -naphthalene is used under-the conditions named in Exam- With 2 (4' aminophenylamino) 6- (4 aminophenylamino) -naphthalene there is obtamed asnmlar rather more greenish-grey tint 1- (4'-aminophenylamino) -5- (4'-amino-' phenylamino) -naphthalene yields violet grey dyeings when the subsequent treatment is with a solution of alkali bichromate and acetic acid. 1'- (4'-aminophenylamino) 5-hydroxynapht-halene yields under like conditions a blue-violet, 2- (4-aminophenylamino) 47-hydroxynaphthalene a bluish violet, 2- (4'-aminophenylamino) -7- (4'-aminophenylamino)-naphthalene a violet grey tint which by prolonged treatment with bichromate and acetic acid becomes violet or bluish.

When the phenyl group contains a substituent such as alkyl or halogen, the applicability of the naphthalene derivative is not affected. 7

What I claim is v L-A process of dyeing pelts, hairs and feathers, by successively treating the goods with an aqueous solution of a salt of a naphthalenederivative of the general formula:

(wherein X means H or an univalent substituent ofthe group consisting of alkyl and.

halogen and wherein Y means H or an univalent substituent of the group consisting of --OH, NH NHaryl-NH and halogen) and with an oxidizing agent.

7. A process of dyeing pelts, hairs and feathers, by successively treating the goods with an aqueous solution of 2-(4-aminophenylamino)-naphthalene hydrochloride and an oxidizing agents.

8. A process of dyeing pelts, h irs and feathers, by successively treating t e mo'rdanted goods with an aqueous solution of .2- (V-aminophenylamino) -naphthalene hydrochloride and an oxidizing agent.

' In testimony whereof, I aifix my signature.

PAUL VIRCK.

2. A process of dyeing pelts, hairs and V feathers, by successively treating the Inordanted goods with'anaqueous solution of a salt of,a.'naphthalene derivative of the gen eral formula:

(wherein X means or an univalent substituent of the group consisting of alkyl and halogen and wherein Y means H or an univalent substituent of the groups consisting of -OH, -'-NH --NHaryl-NH and halogen) and with an oxidizing agent.

3. A process of, dyeing pelts, hairs and feathers, by successively 'treatingthe goods with an aqueous solution of a. salt of a naphthalene derivative of the general formula:

, agent. 40"

danted goods with an aqueous solution of 'a salt of a naphthalene derivative of the gen:

eral formula:

cmHa smNONm)...

(m being a whole number not less than 1 and not greater than 2) and an oxidizing agent.

5. A process of. dyeing pelt s, hairs and feathers, by successively treating the goods with an aqueous solution of a salt of a naphthalene derivative of the general formula:

CnHzHNONH:

and an oxidizing agent.

6. A process of dyeing pelts, hairs and feathers, by successively treating the mor-' T danted goods with an aqueous solution ,of a salt of a naphthalene derivative of the general formula:

and an oxidizing agent.

iss- 

